Towards A Detector-Based Spectral-Radiance Scale in the Near-Ultraviolet

The realization of a new detector-based ultraviolet spectral-radiance scale is presented. The paper describes the characterization of an interference filter radiometer centred at 358 nm and its use to determine a point on the spectral-radiance scale with an uncertainty at 1 sigma of 0,7 %. A comparison of this new scale point with the current UK National Physical Laboratory radiance scale is also presented.